libavfilter/vf_noise: relicense to LGPL

Signed-off-by: Paul B Mahol <onemda@gmail.com>

LICENSE

@@ -36,7 +36,6 @@ Specifically, the GPL parts of FFmpeg are
     - vf_kerndeint.c
     - vf_mcdeint.c
     - vf_mp.c
-    - vf_noise.c
     - vf_owdenoise.c
     - vf_perspective.c
     - vf_phase.c

configure

@@ -2228,7 +2228,6 @@ mp_filter_deps="gpl avcodec swscale inline_asm"
 mpdecimate_filter_deps="gpl avcodec"
 mptestsrc_filter_deps="gpl"
 negate_filter_deps="lut_filter"
-noise_filter_deps="gpl"
 perspective_filter_deps="gpl"
 resample_filter_deps="avresample"
 ocv_filter_deps="libopencv"

libavfilter/vf_noise.c

@@ -5,17 +5,17 @@
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
+ * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License along
- * with FFmpeg; if not, write to the Free Software
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */